8 Jan
2007
8 Jan
'07
7:25 p.m.
Steve wrote....
I found that serial booting the system to be the
easiest way to get
started. I don't recall which one but, one of the loader ROMS will work
with the "high speed serial" card and read data off a serial link.
I don't recall any loader rom working with a 12531 HS TERM board. I could
well be wrong though, it's been WAY too long since I had my head firmly in
HP-world. You CAN do it with a 264x (terminal) loader rom and a BACI board -
as Bob S. said. If there is a loader rom that happens to work with the 12531
(ie, if the 12531 happens to have the same programmatic interface as say...
the paper tape board...) I'd like to know. I just don't have time to go test
it :)
There's no handshaking or error correction but,
with a short RS232 link,
passing data is not a problem. The ABS data format does provide checksum
error detection so data errors will be detected.
Careful there... checksum (mod256) does NOT catch transposition of
bytes/words, missing all zero words/bytes, extra all zero words/bytes, and
identical bits swapped between words/bytes. There is a length field included
in the ABS format so that will catch missing or extra nulls. But it still
won't catch the other errors.
Jay